From them plant fibre is available (4)
I believe the answer is:
hemp
'is available' is the definition.
I can't tell whether this defines the answer.
'from them plant fibre' is the wordplay.
'from' indicates the answer is hidden within the clue.
'HEMP' can be found hidden inside 'them plant fibre'.
Can you help me to learn more?
(Other definitions for hemp that I've seen before include "Rope, cannabis, plant" , "Source of drug" , "Plant fibre used to make rope" , "tea" , "Rope-making fibre" .)